Theme: Enigma Room Oak · a software Enigma I — rotors turned by arithmetic, not clockwork
PROTOTYPE
The rule of this room: A museum piece, for the joy of it. This machine was broken in its own century — real secrecy uses modern cryptography. In this program, that's the Dead Drop.
Rotor windows — the letters showing now
A
LEFT
A
MIDDLE
A
RIGHT
The right rotor steps with every letter. The middle rotor sometimes steps twice in a row — the famous double-stepping anomaly, kept on purpose, exactly as the real machine behaved.
Lampboard
Keyboard — tap a key, or type on your own keyboard
You typed (plaintext in, or ciphertext in — same settings do both)
The lamps answered
Machine settings
Reflector (Umkehrwalze)
Left rotor
Middle rotor
Right rotor
Each rotor may be used only once — the real machine carried one of each. Rotors and their notch (turnover) letters: I — Q · II — E · III — V · IV — J · V — Z.
Plugboard (Steckerbrett)
Sample daily key
SAMPLE — an invented demonstration key, made up for this page. It is not a real historical key sheet.
SAMPLE key: reflector UKW-C · rotors (left to right) II · V · I · rings O·A·K · start Q·E·V · plugs AV BS CG DL FU HZ IN KM OW RT.